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HTML
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<strong class="sidebar-title">Getting Started</strong><a href="intro-to-liquid.html" class="sidebar-link">Intro to Liquid</a><a href="setup.html" class="sidebar-link">Setup</a><a href="options.html" class="sidebar-link">Options</a><a href="render-file.html" class="sidebar-link">Render Files</a><a href="partials-and-layouts.html" class="sidebar-link">Includes and Layouts</a><a href="use-in-expressjs.html" class="sidebar-link">Use in Express.js</a><strong class="sidebar-title">Advanced</strong><a href="caching.html" class="sidebar-link current">Caching</a><a href="register-filters-tags.html" class="sidebar-link">Register Filters/Tags</a><a href="access-scope-in-filters.html" class="sidebar-link">Access Scope in Filters</a><a href="parse-parameters.html" class="sidebar-link">Parse Parameters</a><a href="render-tag-content.html" class="sidebar-link">Render Tag Content</a><a href="sync-and-async.html" class="sidebar-link">Sync and Async</a><a href="whitespace-control.html" class="sidebar-link">Whitespace Control</a><a href="plugins.html" class="sidebar-link">Plugins</a><a href="operators.html" class="sidebar-link">Operators</a><a href="truthy-and-falsy.html" class="sidebar-link">Truthy and Falsy</a><strong class="sidebar-title">Miscellaneous</strong><a href="migrate-to-9.html" class="sidebar-link">Migrate to LiquidJS 9</a><a href="changelog.html" class="sidebar-link">Changelog</a><a href="differences.html" class="sidebar-link">Differences with Shopify/liquid</a><a href="contribution-guidelines.html" class="sidebar-link">Contribution Guidelines</a>
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<h1 class="article-title" itemprop="name">Caching</h1>
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<a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/harttle/liquidjs/edit/master/docs/source/tutorials/caching.md" class="article-edit-link" title="Improve this doc"><i class="icon-pencil"></i></a>
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<p>In a typical website project, we’ll have a directory of view templates and they’ll be rendered multiple times. In production environment the template files are not likely to be changed over time (other than re-deployments). Thus it makes sense to cache the file contents and the parsed templates (in a kind of AST) to improve performance.</p>
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<p>LiquidJS provides multiple ways to cache the parsed templates to improve performance.</p>
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<h2 id="Programmaticly" class="article-heading"><a href="#Programmaticly" class="headerlink" title="Programmaticly"></a>Programmaticly<a class="article-anchor" href="#Programmaticly" aria-hidden="true"></a></h2><p>The <a href="../api/classes/liquid_.liquid.html#parse">.parse()</a>, <a href="../api/classes/liquid_.liquid.html#parseFile">.parseFile()</a>, <a href="../api/classes/liquid_.liquid.html#parseFileSync">.parseFileSync()</a> APIs are used to parse templates from string or files. The result template can be then rendered multiple times with different context.</p>
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<p>Parse from string:</p>
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<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token keyword">var</span> tpl <span class="token operator">=</span> engine<span class="token punctuation">.</span><span class="token function">parse</span><span class="token punctuation">(</span><span class="token string">'{{name | capitalize}}'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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engine<span class="token punctuation">.</span><span class="token function">renderSync</span><span class="token punctuation">(</span>tpl<span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token literal-property property">name</span><span class="token operator">:</span> <span class="token string">'alice'</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token comment">// 'Alice'</span>
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engine<span class="token punctuation">.</span><span class="token function">renderSync</span><span class="token punctuation">(</span>tpl<span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token literal-property property">name</span><span class="token operator">:</span> <span class="token string">'bob'</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token comment">// 'Bob'</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>
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<p>Parse from file:</p>
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<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token keyword">var</span> tpl <span class="token operator">=</span> engine<span class="token punctuation">.</span><span class="token function">parseFileSync</span><span class="token punctuation">(</span><span class="token string">'hello'</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// contents of `hello.liquid`: {{name}}</span>
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engine<span class="token punctuation">.</span><span class="token function">renderSync</span><span class="token punctuation">(</span>tpl<span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token literal-property property">name</span><span class="token operator">:</span> <span class="token string">'alice'</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token comment">// 'Alice'</span>
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engine<span class="token punctuation">.</span><span class="token function">renderSync</span><span class="token punctuation">(</span>tpl<span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token literal-property property">name</span><span class="token operator">:</span> <span class="token string">'bob'</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token comment">// 'Bob'</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>
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<p>The template string/file is parsed only once and renderd multiple times using different context. Templates for different files can be stored into a <code>Map</code> and can be retrieved directly for subsequent renders.</p>
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<h2 id="The-cache-Option" class="article-heading"><a href="#The-cache-Option" class="headerlink" title="The cache Option"></a>The <code>cache</code> Option<a class="article-anchor" href="#The-cache-Option" aria-hidden="true"></a></h2><p>The <a href="../api/interfaces/liquid_options_.liquidoptions.html#Optional-cache">cache option</a> can be set to instruct liquidjs to use cached parsed templates each time you call <a href="../api/classes/liquid_.liquid.html#renderFile">renderFile</a> or <a href="../api/classes/liquid_.liquid.html#renderFilesync">renderFileSync</a>.</p>
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<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token keyword">var</span> <span class="token punctuation">{</span> Liquid <span class="token punctuation">}</span> <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'liquidjs'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">var</span> engine <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Liquid</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
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<span class="token literal-property property">cache</span><span class="token operator">:</span> <span class="token boolean">true</span>
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<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token comment">// liquidjs parses the hello.liquid, then renders it with {name: 'alice'}</span>
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engine<span class="token punctuation">.</span><span class="token function">renderFileSync</span><span class="token punctuation">(</span><span class="token string">'hello'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token literal-property property">name</span><span class="token operator">:</span> <span class="token string">'alice'</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
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<span class="token comment">// liquidjs finds the cached template, then renders it with {name: 'bob'}</span>
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engine<span class="token punctuation">.</span><span class="token function">renderFileSync</span><span class="token punctuation">(</span><span class="token string">'hello'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token literal-property property">name</span><span class="token operator">:</span> <span class="token string">'bob'</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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<time class="article-footer-updated" datetime="2022-12-11T18:33:46.490Z" itemprop="dateModified">Last updated: 2022-12-11</time>
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<a href="use-in-expressjs.html" class="article-footer-prev" title="Use in Express.js"><i class="icon-chevron-left"></i><span>Prev</span></a><a href="register-filters-tags.html" class="article-footer-next" title="Register Filters/Tags"><span>Next</span><i class="icon-chevron-right"></i></a>
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<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#Programmaticly"><span class="toc-text">Programmaticly</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#The-cache-Option"><span class="toc-text">The cache Option</span></a></li></ol>
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